Question

52. A precipitator is a type of a air filter b. lightning rod c. small wire d. power supply 53. T he precipitator set of plates with a a. negative b. positive uses a high voltage DC power supply to provide a set of wires with a positive charge and a charge. 54. A static electric charge is an electric charge which, moving. a. is b. is not 55. Insulators are the only materials that can hold stationary a. atoms b. electrons Bringing a charged test object near the ball of a charged electroscope causes the leaves to move closer a. same b. opposite The current flow that occurs within a lightning bolt flows 56. together. This indicates that the test object charge is the polarity as the electroscope charge 57. from positive to negative from negative to positive a. b. c. in both directions If a thundercloud has a positive charge, the current in the lightning bolt will flow from the a. ground to the cloucd b. cloud to the ground 58. The lightning protection device that does not connect directly to the object to be protected is called the lightning a. arrestor b. catcher c. umbrella d. rod s9.